99.2% is the change from 501 to 998
Calculation steps:
[( 998 - 501 ) ÷ 501] x 100 = 99.2%
Formula
Percentage change = [(998 - 501) / 501] x 100
Subtract the new number by the original number
998 - 501 = 497
497 ÷ 501 = 0.9920159680638723
0.9920159680638723 x 100 = 99.2%